現(xiàn)在進(jìn)行時(shí)

　a. 表示現(xiàn)在( 指說(shuō)話(huà)人說(shuō)話(huà)時(shí)) 正在發(fā)生的事情。

　　 We are waiting for you.

　b. 習(xí)慣進(jìn)行：表示長(zhǎng)期的或重復(fù)性的動(dòng)作，說(shuō)話(huà)時(shí)動(dòng)作未必正在進(jìn)行。

　　 Mr. Green is writing another novel.　

　　　(說(shuō)話(huà)時(shí)并未在寫(xiě)，只處于寫(xiě)作的狀態(tài)。)

　　 She is learning piano under Mr. Smith.

　c. 表示漸變的動(dòng)詞有：get, grow, become, turn, run, go, begin等。

　　 The leaves are turning red.

　　 It's getting warmer and warmer.

　d. 與always, constantly, forever 等詞連用，表示反復(fù)發(fā)生的動(dòng)作或持續(xù)存在的狀態(tài)，往往帶有說(shuō)話(huà)人的主觀(guān)色彩。

　　 You are always changing your mind.

典型例題

　 My dictionary ___, I have looked for it everywhere but still___ it.　

　A. has lost, don't find　　 B. is missing, don't find　C. has lost, haven't found　 D. is missing, haven't found.　　

　 答案D. 前句是一個(gè)仍在持續(xù)的狀態(tài)，應(yīng)用進(jìn)行時(shí)，由于沒(méi)有找到，其影響仍然存在，應(yīng)用完成時(shí)，瞬間動(dòng)詞用于否定式時(shí)可用于完成時(shí)。